Centrino Wireless-N 1030 randomly disconnecting

Bug #1420935 reported by Viktor Pal on 2015-02-11
This bug affects 2 people
Affects Status Importance Assigned to Milestone
linux-firmware (Ubuntu)

Bug Description

1) The release of Ubuntu you are using:
Description: Linux Mint 17.1 Rebecca
Release: 17.1

Ubuntu version:
Ubuntu 14.04

2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
Maybe linux-image, linux-firmware or network-manager.

3) What you expected to happen
Permanent wifi connection.

4) What happened instead
Wireless is disconnecting randomly.

This wifi card was working for me with Ubuntu 12.04 for several years before flawlessly.
Now I installed Linux Mint based on Ubuntu 14.04 and it is now randomly disconnecting.
When it disconnects I disable wireless in the NM applet and enable it again and wifi reconnects.
Logs regarding the disconnect and the reconnect are attached to the report.

The disconnect happens 10 to 60 minutes after it was connected or reconnected.

The laptop I'm using is a Dell Inspiron N5110 which is officially supported by Ubuntu:

It seems that I'm not the only one with this issue:

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-firmware 1.127.11
ProcVersionSignature: Ubuntu 3.13.0-37.64-generic
Uname: Linux 3.13.0-37-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
Date: Wed Feb 11 20:14:39 2015

PackageArchitecture: all
SourcePackage: linux-firmware
UpgradeStatus: No upgrade log present (probably fresh install)

Viktor Pal (deere) wrote :
Viktor Pal (deere) wrote :
Viktor Pal (deere) wrote :
Viktor Pal (deere) on 2015-02-11
description: updated
Viktor Pal (deere) wrote :

To workaround this bug.

Create a file named: /etc/modprobe.d/wifi_bug.conf

Add the following lines to the file:
options iwlmvm power_scheme=1
options iwlwifi bt_coex_active=N swcrypto=1 11n_disable=1

Set the file's ownership the same as other files in that folder.


Please note though that this fixes the issue, but prevents N mode from working, so you are stick with B and G modes.

Otherwise I'm very disappointed that no one cares about this bug as I would be glad to provide all the information I'm able to to get this fixed.
The other thing that makes me very sad is that this was already working perfectly in the past with 12.04 and now it isn't.
This really sounds to me like a step backwards...

Sorry for being emotional.

Viktor Pal (deere) wrote :

This error still exists with the linux-image-extra-3.16.0-31-generic kernel.
I have also filed this bug here: https://bugzilla.kernel.org/show_bug.cgi?id=94341

Viktor Pal (deere) wrote :

Just to follow up on this.
I upgraded a few weeks before to Ubuntu 15.10 and it looks like this bug is completely fixed.

It has the following kernel:
Linux 4.2.0-18-generic #22-Ubuntu SMP Fri Nov 6 18:25:50 UTC 2015 x86_64 GNU/Linux

Wifi works stable without any additional tweaks.

Happy that this was fixed, thanks.

Changed in linux-firmware (Ubuntu):
status: New → Fix Released
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